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      1 
      2 /*
      3  * Copyright (C) 2017 The Android Open Source Project
      4  *
      5  * Licensed under the Apache License, Version 2.0 (the "License");
      6  * you may not use this file except in compliance with the License.
      7  * You may obtain a copy of the License at
      8  *
      9  *      http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  * Unless required by applicable law or agreed to in writing, software
     12  * distributed under the License is distributed on an "AS IS" BASIS,
     13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  * See the License for the specific language governing permissions and
     15  * limitations under the License.
     16  */
     17 //#define LOG_NDEBUG 0
     18 #define LOG_TAG "DescramblerImpl"
     19 
     20 #include <media/cas/DescramblerAPI.h>
     21 #include <media/DescramblerImpl.h>
     22 #include <media/SharedLibrary.h>
     23 #include <utils/Log.h>
     24 #include <binder/IMemory.h>
     25 
     26 namespace android {
     27 
     28 static Status getBinderStatus(status_t err) {
     29     if (err == OK) {
     30         return Status::ok();
     31     }
     32     if (err == BAD_VALUE) {
     33         return Status::fromExceptionCode(Status::EX_ILLEGAL_ARGUMENT);
     34     }
     35     if (err == INVALID_OPERATION) {
     36         return Status::fromExceptionCode(Status::EX_ILLEGAL_STATE);
     37     }
     38     return Status::fromServiceSpecificError(err);
     39 }
     40 
     41 static String8 sessionIdToString(const CasSessionId &sessionId) {
     42     String8 result;
     43     for (size_t i = 0; i < sessionId.size(); i++) {
     44         result.appendFormat("%02x ", sessionId[i]);
     45     }
     46     if (result.isEmpty()) {
     47         result.append("(null)");
     48     }
     49     return result;
     50 }
     51 
     52 DescramblerImpl::DescramblerImpl(
     53         const sp<SharedLibrary>& library, DescramblerPlugin *plugin) :
     54         mLibrary(library), mPlugin(plugin) {
     55     ALOGV("CTOR: mPlugin=%p", mPlugin);
     56 }
     57 
     58 DescramblerImpl::~DescramblerImpl() {
     59     ALOGV("DTOR: mPlugin=%p", mPlugin);
     60     release();
     61 }
     62 
     63 Status DescramblerImpl::setMediaCasSession(const CasSessionId& sessionId) {
     64     ALOGV("setMediaCasSession: sessionId=%s",
     65             sessionIdToString(sessionId).string());
     66 
     67     return getBinderStatus(mPlugin->setMediaCasSession(sessionId));
     68 }
     69 
     70 Status DescramblerImpl::requiresSecureDecoderComponent(
     71         const String16& mime, bool *result) {
     72     *result = mPlugin->requiresSecureDecoderComponent(String8(mime));
     73 
     74     return getBinderStatus(OK);
     75 }
     76 
     77 Status DescramblerImpl::descramble(
     78         const DescrambleInfo& info, int32_t *result) {
     79     ALOGV("descramble");
     80 
     81     *result = mPlugin->descramble(
     82             info.dstType != DescrambleInfo::kDestinationTypeVmPointer,
     83             info.scramblingControl,
     84             info.numSubSamples,
     85             info.subSamples,
     86             info.srcMem->pointer(),
     87             info.srcOffset,
     88             info.dstType == DescrambleInfo::kDestinationTypeVmPointer ?
     89                     info.srcMem->pointer() : info.dstPtr,
     90             info.dstOffset,
     91             NULL);
     92 
     93     return getBinderStatus(*result >= 0 ? OK : *result);
     94 }
     95 
     96 Status DescramblerImpl::release() {
     97     ALOGV("release: mPlugin=%p", mPlugin);
     98 
     99     if (mPlugin != NULL) {
    100         delete mPlugin;
    101         mPlugin = NULL;
    102     }
    103     return Status::ok();
    104 }
    105 
    106 } // namespace android
    107 
    108